Patent GB-191320945-A (GB)
Title: Improvements in Press Feeders.
IPC: B41F1/28
Filed: 1913-09-16
Granted: 1915-01-14
Abstract: 20,945. Marks, E. C. R., [Miller Saw-Trimmer Co.]. Sept. 16. Sheet-carriers; grippers and gripper mechanism. - Relates to platen presses of the oscillating platen type in which reciprocating grippers travelling substantially parallel to the platen when in its stationary position convey sheets from a separator to the platen. The gripper carriage is arrested when near the end of its return stroke while the grippers are opened and then completes the stroke to take a sheet separated from a pile, and a carriage moves on guides which are rocked after the carriage has moved over the platen so as to lift the carriage clear of the platen for the return stroke. The pile of sheets are placed on a table D<3> which may be elevated in the manner described in Specification 20,951/13, and the top sheet is raised by a separator, such for example as that described in Specification 20,946/13, into position to be taken by grippers H<25>, H<26>, Fig. 7, adjustably carried by a cross-bar H<19> secured to slides H<15>, Figs. 1 and 2, reciprocating in guides H<14> carried by loose brackets H<1> on a shaft H<2> mounted in a hood or frame supporting the feed mechanism. The platen B is oscillated on trunnions B' by a cam groove on a wheel A<4> on the main shaft which wheel drives at the same speed through back gear a shaft F<10> carrying a groove cam H<8>, Fig. 2, for oscillating a pivoted quadrant H<5> gearing with a pinion H<4> on the shaft H<2>, whereby wheels H<3> on the shaft gearing with racks on the gripper slides H<15> reciprocate the grippers, the platen remaining at rest at this time. At the end of the outward travel, when the grippers have delivered the sheet to registering fingers, the guides H<14> are tilted by a cam H<17>, Fig. 2, so as to raise the grippers clear of the platen for their return travel, which is arrested just before completion, owing to the shape of the cam groove H<8>. At this time a hook H<39> carried by a pivoted bell-crank H<38> lies under a spring-pressed bar H<29>, Figs. 7 and 8, controlling the upper gripper member H<26> and is now lifted by means of a cam H<40> to open the grippers while their return movement is completed by the cam H<8> so as to take a fresh separated sheet, the cam H<40> then permitting the gripper to close. Each gripper comprises a member H<22>, Fig. 7, adjustably secured to a cross-bar H<19> on the slides, and a member H<26> slidably mounted in the member H<22> and normally pressed down through a spring H<27> by the bar H<29> carried by pivoted brackets H<30> and controlled by spring-pressed rods H<33>, Fig. 8, guided in a bracket H<32> on the crossbar H<19>. As the grippers move outwards over the platen a cam bar on the guides H<14> acts on a pivoted trigger to move a rod H<35> longitudinally, whereby a cranked part of the rod engaging the brackets H<30> turns them on their pivots so as to carry the bar H<29> clear of the springs H<27> of each gripper set. The grippers thus only hold the sheet by the weight of the upper member H<26> and slip when the sheet is taken by the registering fingers. When on the return of the gripper the hook H<39> lifts the bar H<29>, this bar acts against lips H<28> on the members H<26> thus opening the grippers against the action of the springs H<27>.